package my.study.demo.proxy.other.study;

/**
 * Hello world!
 *
 */
public class App {
    public static void main( String[] args ) {
        System.out.println(App.class.getPackage().toString());

        StringBuilder sb = new StringBuilder();

        sb.append("a").append("b").append("c,");
        sb.deleteCharAt(sb.length() - 1 );
        System.out.println(sb);
    }
}
